Seized by the System - Chapter 30: Host, The 2-in-1 Meal You’re Afraid Of Is Here

In a world dotted with World Entrances to a demon world, demons have invaded humans for centuries. Humanity has united and one of the most ancient sects in the world, the Archean Mountain Sect, has set up an entire education system in the form of Dao Academies and defenses at the World Entrances.

Hello, welcome to join the scp foundation, as a D-level personnel, you will get the following benefits:

First, you will get a unique identification number printed on your brand new orange clothes (prison uniform), such as D-213.

That’s not enough, you will also get a brand new name, which you will use to communicate with each other in the future! Like Billy-D.

As a D-Class, you just have to satisfy your superiors, and they’re good guys with guns! They will help you to have friendly interactions with all kinds of safe creatures (help the ten-meter killer lizard clean the room)

In order to protect your health at all times, our infirmary is always open, even if your work here is as easy as taking a walk!

When you’re done with a D-Class for a month, you can go home (and be shot), no matter what prisoner you were-

Don’t wait any longer, come and join scp!

- Description from novelbuddy

A man is reborn into the world of Avatar: The Last Air Bender as a waterbender from Katara's tribe. Best of all, he was the same age as her, and he had a system with him to help.He knows the future and a system that lets him continuously get stronger by completing quests or long-term missions, as well as giving him the ability to copy abilities from others for himself. He will become invincible in the world of Avatar, even more so than the Avatar himself.

The main character is reborn as a character from a game he played in his previous life. This character falls into ruin along with the villainess, spending the last of their years together. A man named Kururi Helan.